Teensy 3.1 has the same size, shape & pinout; is compatible with
code written for Teensy 3.0, and is well supported on the Arduino IDE
using Teensyduino. Teensy 3.1 adds several new features, due to an
upgraded microcontroller. Here are the highlights. A table of technical
specifications is show below.

Teensy 3.1 has the same size, shape & pinout; is compatible with
code written for Teensy 3.0, and is well supported on the Arduino IDE
using Teensyduino. Teensy 3.1 adds several new features, due to an
upgraded microcontroller. Here are the highlights. A table of technical
specifications is show below.